[mw_shl_code=c,true]void TIM8_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; TIM_BDTRInitTypeDef TIM_BDTRInitStructure; RCC_APB1PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC , ENABLE); //使能GPIO外设时钟使能 //设置该引脚为复用输出功能,输出TIM3 CH1的PWM脉冲波形 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //TIM_CH1 ，CH2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7|GPIO_Pin_8; //TIM_CH1 ，CH2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频 TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能 TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set; TIM_OC2Init(TIM8, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable); //CH1预装载使能 TIM_OC3Init(TIM8, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable); //CH1预装载使能 TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF; TIM_BDTRInitStructure.TIM_DeadTime = 7; TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure); TIM_CtrlPWMOutputs(TIM8,ENABLE); //MOE 主输出使能 // TIM_CCPreloadControl(TIM8, ENABLE); // TIM_SelectCOM(TIM8,ENABLE); // TIM_SelectInputTrigger(TIM8, TIM_TS_ITR2); TIM_ITConfig(TIM8, TIM_IT_COM, ENABLE); TIM_ARRPreloadConfig(TIM8, ENABLE); //使能TIMx在ARR上的预装载寄存器 TIM_Cmd(TIM8, ENABLE); //使能TIM3 }[/mw_shl_code] 我的设置是不是哪不对，一直不能输出PWM波。一直在看刹车和死区的东西，但是一直不得解，求大神。